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                [Scoi2015]小凸玩密室                </h1>
                <p>时间限制：10s&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;  空间限制：128MB</p>			</div>
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                                <h3>题目描述</h3><p><div>小凸和小方相约玩密室逃脱，这个密室是一棵有n个节点的完全二叉树，每个节点有一个灯泡。点亮所有灯</div>
<div>泡即可逃出密室。每个灯泡有个权值Ai，每条边也有个权值bi。点亮第1个灯泡不需要花费，之后每点亮4</div>
<div>个新的灯泡V的花费，等于上一个被点亮的灯泡U到这个点V的距离Du,v，乘以这个点的权值Av。在点灯</div>
<div>的过程中，要保证任意时刻所有被点亮的灯泡必须连通，在点亮一个灯泡后必须先点亮其子树所有灯泡才能点亮其他灯泡。请告诉他们，逃出密室的最少花费是多少。</div>
<p></p></p><hr/><h3>输入格式</h3><p><div>第1行包含1个数n，代表节点的个数</div>
<div>第2行包含n个数，代表每个节点的权值ai。(i=l，2，&hellip;，n)</div>
<div>第3行包含n-l个数，代表每条边的权值bi，第i号边是由第(i+1)/2号点连向第i+l号点的边。</div>
<div>(i=l，2...N-1)</div>
<p></p></p><hr/><h3>输出格式</h3><p><div>输出包含1个数，代表最少的花费。</div>
<p></p></p><hr/><h3>样例输入</h3><pre>3 
5 1 2
2 1</pre><hr/><h3>样例输出</h3><pre>5
</pre><hr/><h3>提示</h3><p><p>对于100%的数据，1&le;N&le;2&times;105，1&lt;Ai,Bi&le;10^5</p>
<p></p></p><hr/><h3>题目来源</h3><p>没有写明来源</p>
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